import {Match} from '../Any/_Internal'
import {Is} from '../Any/Is'

/**
 * @hidden
 */
export type _SelectKeys<O extends object, M extends any, match extends Match> = {
    [K in keyof O]-?: {
        1: K
        0: never
    }[Is<O[K], M, match>]
}[keyof O]

/**
 * Get the keys of `O` which fields match `M`
 * @param O to extract from
 * @param M to select fields
 * @param match (?=`'default'`) to change precision
 * @returns [[Key]]
 * @example
 * ```ts
 * ```
 */
export type SelectKeys<O extends object, M extends any, match extends Match = 'default'> =
    O extends unknown
    ? _SelectKeys<O, M, match>
    : never
